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Search: Posts Made By: DoctorDoctor
Forum: Conservation 01-28-21, 04:24 PM
Replies: 7
Views: 1,024
Posted By DoctorDoctor
Keeping sand and other particulate matter (shingle grit) out.

You need a small tank (rainbarrel or half a rainbarrel. Water comes intake on one side and leaves the other. The input and output is at the top. Sand and grit will fall to the bottom. Needs to be...
Forum: Conservation 01-24-19, 10:15 PM
Replies: 569
Views: 662,499
Posted By DoctorDoctor
the outgoing interior air has the humidity. It...

the outgoing interior air has the humidity. It meets the incoming cold air and condenses. Not sure how you are going to deal with this in your coroplast
Forum: Geothermal & Heat Pumps 01-02-19, 06:28 AM
Replies: 6
Views: 1,739
Posted By DoctorDoctor
Thanks for your input. Plastic pipe, both PVC and...

Thanks for your input. Plastic pipe, both PVC and ABS, is being used for sewage lines. Of course, cast iron is as well and would have better heat transfer characteristics.

As for digging wells,...
Forum: Geothermal & Heat Pumps 01-02-19, 05:41 AM
Replies: 6
Views: 1,739
Posted By DoctorDoctor
I am not quite sure what you mean about pressure...

I am not quite sure what you mean about pressure drop. The beauty of (relatively) low flow through large diameter pipes is that the flow is governed by Bernoulli's equation. Now Bernoulli's equation...
Forum: Geothermal & Heat Pumps 12-17-18, 09:14 AM
Replies: 6
Views: 1,739
Posted By DoctorDoctor
here is the diagram

Easy question for DIY plumbers is how to run a 2 inch pvc pipe down the middle of a 6 or 8 inch pipe?
Forum: Geothermal & Heat Pumps 12-17-18, 09:10 AM
Replies: 6
Views: 1,739
Posted By DoctorDoctor
Combination vertical/horizontal geothermal

My idea is this: dig 10 to 20 ten foot wells and use, say 6 or 8 inch pvc pipes (available at the box stores). Put a plug at the bottom. have a reducing T-connector and a PVC plug in the top. Have a...
Forum: Conservation 01-08-13, 07:06 AM
Replies: 100
Views: 83,083
Posted By DoctorDoctor
Great discussion. The kicker in all of this is...

Great discussion. The kicker in all of this is the darn lint. It complicates things and can be a fire hazard. I saw a you tube video (http://www.youtube.com/watch?v=vfExQ3mwBH8) on the use of the...
Forum: Conservation 09-22-11, 06:38 PM
Replies: 569
Views: 662,499
Posted By DoctorDoctor
Piwoslaw writes, "Have the inbound cold air in...

Piwoslaw writes, "Have the inbound cold air in the outer layer. That way the warmer, outbound air doesn't lose heat through the outer wall - more of it can be absorbed by the inbound stream."

My...
Forum: Conservation 09-22-11, 06:32 PM
Replies: 569
Views: 662,499
Posted By DoctorDoctor
Really simple heat exchanger

Yes, I was thinking of using fins to hold the center pipe. My point is to use K.I.S.S. (keep it simple stupid). Sure one can design and make a air to air heat exchanger with near perfect numbers -...
Forum: Conservation 09-22-11, 08:08 AM
Replies: 569
Views: 662,499
Posted By DoctorDoctor
I actually have been thinking about this very...

I actually have been thinking about this very problem, a diy, inexpensive air to air heat exchanger. I would like to do this for my crawl space. I am not a big believer in radon risks. I thought...
Forum: Solar Heating 09-18-11, 10:14 PM
Replies: 7
Views: 5,021
Posted By DoctorDoctor
160 degree water into the hot water line is...

160 degree water into the hot water line is dangerous! A mixing valve is mandatory. Here is one from Amazon: Amazon.com: Honeywell R-AM-101C-US-1 Thermostatic Mixing Valve: Home Improvement...
Forum: Solar Heating 09-18-11, 05:28 PM
Replies: 25
Views: 52,214
Posted By DoctorDoctor
I can't believe that one can do better than this...

I can't believe that one can do better than this heat exchanger here:

$1000 solar water heating system -- storage tank (http://www.builditsolar.com/Experimental/PEXColDHW/TankConstruction.htm)
...
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